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BrokenBiker
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ali in the title
wheresmejumper
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200 amps minimum, ive done 6mm with a 2.4 tungsten but not for huge amounts.
Based on
You need enough juice to create one weldpool at the root of the joint and add wire to that. Size (overall mass) of the weldment and preheat all effect how much juice is actually needed i.e. if you've only got 160A to play with then more preheat will be needed and you'll still struggle if the thing is large.
Any convenient heat source will do for preheat... stick it in the oven if it fits, plumbers gas torch, leccy heat gun etc etc
it sounds your arc length may be too long... http://www.mig-welding.co.uk/forum/threads/arc-length.7862/ Also covered here... http://www.mig-welding.co.uk/tig-fillet-weld.htm
You need enough juice to create one weldpool at the root of the joint and add wire to that. Size (overall mass) of the weldment and preheat all effect how much juice is actually needed i.e. if you've only got 160A to play with then more preheat will be needed and you'll still struggle if the thing is large.
Any convenient heat source will do for preheat... stick it in the oven if it fits, plumbers gas torch, leccy heat gun etc etc
Liquid Metal
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On a couple of jobs ive had before now, when welding thick ally, used a helium/argon mix. Gives you a much higher heat input than straight argon gas for a given amperage setting
Rrunnach
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Oops!
chevy2
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Helium adds heat as it increases the arc voltage. It's also got a higher ionisation potential which is a fancy way of saying the HF start won't work as well and one of the reasons why it's usually mixed with argon- arc starting and stability. Another is because helium is 'kin expensive being a finite resource that's running out. On the off chance anyone is thinking about it balloon helium won't work, it's air with enough helium to make balloons float or something along those lines
Different BOC alushield flavours... http://www.boconline.co.uk/internet.lg.lg.gbr/en/images/Alushield_LUH410_55529.pdf Air Products just do the one flavour (alumaxx?) i think which is 25 or 30% He
Different BOC alushield flavours... http://www.boconline.co.uk/internet.lg.lg.gbr/en/images/Alushield_LUH410_55529.pdf Air Products just do the one flavour (alumaxx?) i think which is 25 or 30% He
Lawnmowerboy
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A bit off topic but does it then become TAG welding? Since you're using the gas to add heat to the weld+
Shox Dr
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I was listening to some 'bod' on the radio a while back, and he said that while there was no threat of using all the Helium up.
It was more to do with costs and production, as they wanted it all for filling gizmos
Liquid Metal
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No because Helium is also an inert gas.
One example of Tag welding would be welding stainless steel or nickel alloys such as Monel or Inconel, with a blend of Argon and (2 - 10% i think??) Hydrogen. This helps puddle wetting out by making it more fluid, also increases arc temperature similar to helium giving better penetration on thicker materials and gives you a very clean weld pool therefore a pucka shiny finish lol.
Lawnmowerboy
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Aah! Explains it then. But co2 is an inert gas but when used in mig welding it technically becomes MAG
